I have a Lenovo B5400 with Ubuntu 14.04 x64. The ethernet port works fine. How can I enable/disable the wifi connection? I have no hardware button for this functionality. Under Windows I can press Fn+F5 and a dialog window appears, but I cannot find this functionality under Linux.

lspci | grep Network produces:

04:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter

The answer from here is incomplete; any other idea?


Later edit: The output of rfkill list all is:

0: tpacpi_bluetooth_sw: Bluetooth Soft blocked: yes Hard blocked: yes

1: hci0: Bluetooth Soft blocked: yes Hard blocked: no

2: phy0: Wireless LAN Soft blocked: yes Hard blocked: yes

2 Answers 2


You can turn off your wifi using iwconfig.
To do that open a terminal and type the following command:

iwconfig wlan0 down

That should turn off your wifi. To turn it on you can use:

iwconfig wlan0 up

You can also turn it on/off using the wireless settings menu. Go to system setings → network → wireless. There you can turn it on/off. enter image description here enter image description here

  • Thanks for your answer. When I press on the on/off button you highlighted in the last picture, the button remains on the off position. Any clue? Jun 29, 2014 at 10:38
  • please post the output of rfkill list all
    – M.Tarun
    Jun 29, 2014 at 10:39
  • Added as later edit for the question. Jun 29, 2014 at 10:54

A dirty trick worked: I booted the machine in Windows and started the wifi from Fn+F5 combination; note that this works in windows only when HotKey Intergration Driver is installed from lenovo site.

The main question is: what if one gets the laptop w/o Windows, e.g. free dos or linux pre-installed?


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